<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
<?php
use \yii\helpers\Html; //引入命名空间
use \yii\helpers\HtmlPurifier;
?>

<p>
    <?=Html::encode($str)?>
    <?=HtmlPurifier::process($str)?>
</p>

</body>
</html>

